32 Botanical Section [PT I 



Arundo Phragmites (p. 66), ligule represented by a 



fringe of hair; aquatic. 

 Digraphis arundinacea (p. 95), ligule membranous 



and well developed ; aquatic. 



B. (continued). Shoot cylindrical (circular or oval in transverse 

 section), plants more or less hairy or pubescent. 



(a) With auricles (very small in H. pratense}. 



Bromus asper (p. 85), sheath entire and bearing 



long reflexed hairs; shade species. 

 Hordeum pratense (p. Ill), blades firm, hairy above, 



glabrous and glossy below. 

 H. murinum (p. 109), blades thin and softly hairy 



on both surfaces; annual. 

 1 Agropyrum repens (p. 51), well developed rhizomes; 



hairs chiefly on upper surface of blade. 

 Triticum sativum (common Wheats), hairs on edges of 

 auricles; sheath pubescent (different varieties 

 vary much in these respects). 



^Secale cereale (Rye), short and long hairs on sheath; 

 base of sheath reddish in colour. Auricles slight. 



(b) Without auricles. 



Holcus lanatus (p. 106), blades velvety to touch; 



pink veins on basal sheaths. 

 1 Arrhenatherum avenaceum (p. 63), sparsely hairy on 



sheath or blade; ligule blunt; roots yellow; 



tufted. 

 Avena flavescens (p. 68), pale green blades which 



are thin, dull, and hairy on both sides ; reflexed 



hairs on sheath. 

 Anthoxanthum odoratum (p. 61), long hairs at juncture 



of sheath and blade ; sweet-scented. 

 Briza media (p. 77), blades with rough hairy margins 



and low flat ribs. 

 Bromus arvensis and vars. (pp. 79-82), entire sheaths 



with slight keel or none; softly downy. 

 B. sterilis (p. 82), as B. arvensis but keel more 



prominent on sheath; ligule deeply ragged. 

 1 Hairiness varies considerably in these species. 



